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Tim's Auto Repair, mechanic

Category: Chevy

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Experience: Have owned a repair shop for 25 yrs.

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I have a 2002 Silverado 1500HD 6.0L 4L80E with a noise I cant

Resolved Question:

I have a 2002 Silverado 1500HD 6.0L 4L80E with a noise I can't figure out. I've noticed a steady buzzing/squeaking noise coming from my truck when I'm somewhere that has a wall or something to reflect the sound. It does not make it when I'm in park or neutral, but when I'm in a drive gear it makes it. It sounds like it is coming from underneath the cab. Transmission related maybe?

first,replace the transmission filter,it may be clogged,,the transmission fluid pump may make a whining noise when it is starving for fluid...but,from the way you describe the sound,i think the torque converter is bad,..this would only may a noise wile in gear

thanks

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I forgot to tell you that it has been very long since i change my transmission filter. Also, I got a buddy to go through the gears while I got down and listened. Its more of a whistling noise and it only does it in 1st, 3rd, and drive.

change the transmission filter,,,but,it still worries me that it don't do it in [n]..this is what is telling me it is the converter,,,,in gear,the converter stater is holding and there is pressure on the converter..but ,do change the filter first,it may just be starving for fluid

Also if the transmission is put under extreme load from downshifting i can hear a clattering noise. Could that also be the torque converter or does that sound more internal. Or could possibly be the u-joints going bad?

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